The features of the classical, clinical and hematological response to the administration of liver (1) and of stomach (2) preparations, and recently of synthetic L. casei factor (3, 4) in patients with untreated pernicious anemnia, are well known. The action of these therapeutic agents is, however, sometimes rather carelessly regarded as one of direct stimulation of blood production. It is perhaps more accurate to consider that liver extract acts by the replacement of a nutritional deficiency and so, in one way or another, permits effective response of the bone marrow to the stimulus of the anoxia common to all anemias. Moreover, despite an obvious analogy with the effects of iron administration in patients with hypochromic (iron deficiency) anemia, the concept that liver extract therapy in pernicious anemia also acts by abolishing a maturation arrest leading to decreased blood production has recently been challenged (5 to 7). This represents a return to the older viewpoint that the anemia is based on excessive blood destruction, manifest especially by the increased output of bile pigments in the feces. Under this hypothesis, the nutritional deficiency is assumed in some way to permit the advent of a hemolytic process (7), and the absence of elevated reticulocyte counts in the peripheral blood is explained on the hypothesis that these cells are destroyed selectively before they leave the bone marrow (5). The megaloblastic hyperplasia of that organ is thus interpreted as an unusually severe degree of the erythroid cell immaturity seen in the bone marrows of severe hemolytic anemias in animals (8) and in man (9, 10). It appeared to be desirable to secure, if possible, additional information on some of these points of view, and to attempt to distinguish between the direct effects of liver extract therapy and those due to elevations 1 The expenses of this investigation were defrayed in part by grants from the J. K. Lilly Gift to the Harvard Medical School.in hemoglobin levels following its use. Accordingly, observations were made of the comparative hematological and clinical effects of rapidly repeated transfusions, and of the administration of liver extract in pernicious anemia.
METHODSFive patients with classical Addisonian pernicious anemia in relapse were selected, and were given daily transfusions of whole blood or red cell concentrates until, in 2, the red cell counts reached 3 million per cu. mm., and in 3, the red cell counts reached 5 million per cm. mm. Liver extract was then administered to the 2 patients with red cell counts of 3 million per cu. mm., and to 2 of the 3 patients with 5 million red cells per cu, mm. The remaining patient with a normal red cell value was given no further therapy for 46 days, when his red cell count had fallen to 3 million per cu. mm. Liver extract was then administered. Both during the period of transfusion, and after liver extract administration, the changes in clinical condition were observed, as well as changes in red cell count, hemoglobin concentration, corpuscular indic...